Added GitHub version of easy_thumbnails to requirements
Added GitHub version of easy_thumbnails to requirements

The version 2.3 in the package directory is not compatible with Django 1.10+. The
GitHub version is.

Signed-off-by: Jim Martens <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@2martens.de>

frmwrk123/austerity-website,frmwrk123/austerity-website